Is it possible to transfer NES, SNES, Sega Genesis, or N64 ROMS onto blank game cartridges from a computer?

The answer is yes. This is just a reply to a question posted a few weeks ago that was "resolved" but the resolved question is not true. Anyways here is some solutions:

http://www.tototek.com/
This is a blank snes rom. It can hold up to 4 games, but also allows as many reprogramming jobs as needed.

http://www.retrousb.com
This is a blank nes rom and can hold just about every nes game ever made on one cart.

tototek also carries some extra stuff items like genesis etc. I am too lazy to figure out if there is blank cartridges for n64.